Toothbrush head



FIG. 1 is a front view of the toothbrush head;

FIG. 2 is a right side view thereof; the left side being a mirror image;

FIG. 3 is a rear view thereof; and,

FIG. 4 is a top view thereof.

The broken lines showing bristles and a handle illustrate portions of the toothbrush head and environmental structure that form no part of the claimed design. 

The ornamental design for a toothbrush head, as shown and described. 